[Bug 233588] flip-flop test case: usr.bin.procstat.procstat_test.environment

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233588

--- Comment #4 from commit-hook at freebsd.org ---
A commit references this bug:

Author: jilles
Date: Wed Sep 18 19:21:20 UTC 2019
New revision: 352491
URL: https://svnweb.freebsd.org/changeset/base/352491

Log:
  MFC r351819: procstat/tests: Fix flakiness by waiting for program to start

  Some of the procstat tests start a program "while1" and examine the process
  using procstat, but did not wait properly for it to start (kill -0 will
  succeed immediately after the child process has been created).

  Instead, have "while1" write something when it starts, and use a fifo to
  wait for that.

  PR:           233587, 233588

Changes:
_U  stable/12/
  stable/12/usr.bin/procstat/tests/procstat_test.sh
  stable/12/usr.bin/procstat/tests/while1.c

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